I 4 I 



Both specimens are very young; a figure after a living animal has been given in 

 Monograph L of this work, amongst the Opisthobranchiata, PI. V, fig. 21. 



2. Amphiperas lacteum Lamarck. 



LAMARCK. An. s. vert. Ed. II, Vol. X, p. 469. 



KlENER. Coq. Viv. Vol. I, Ovula, p. 8, PI. 6, fig. 1. 



REEVE. Conch. Ie. Vol. XV, Ovulum, fig. 1. 



WEINKAUFF. Martini-Chemn. Conch. Cab. Ed. II, Vol. V, Ovula, p. 170, PI. 44, fig. 1, 2. 



TRVON. Man. of Conch. Vol. VII, p. 247, PI. 2, fig. 2, 23, 24. 



Stat. 66. Bank between islands of Bahuluvvang and Tambolungan, South of Saleyer. 8 M. 



Dead coral, Halimeda, Lithothamnion. 2 Spec. 

 Stat. 131. Beo, Karakelang-islands. Reef. 1 Spec. 



I think Tryox is right in uniting A. semistriatum with this species. Indeed I have never 

 seen fresh specimens of A. lactcicm, without more or less impressed striae at both extremities 

 of the shell. 



3. Amphiperas padieum A. Adams. 



ADAMS. Proc. Zool. Soc. Lond. 1854, p. 131. 



REEVE. Conch. Ie. Vol. XV, Ovulum, fig. 6. 



WEINKAUFF. Martini-Chemn. Conch. Cab. Ed. II, Vol. V, Ovula, p. 172, PI. 45, fig. 3, 4. 



Trvon. Man. of Conch. Vol. VII, p. 247, PI. 2, fig. 29—31. 



Stat. 2. Madura-strait. 56 M. Grey mud with some radiolariae. 1 Spec. 



Stat. 98. 6°9'N., i20°2i'E. Sulu Sea. 350 M. Sand. 1 Spec. 



Stat. 285. South coast of Timor. 36 M. Limit between mud and coral. 1 Spec. 



The specimens are very small, that from Stat. 285 measures only 8 Mill. in length, that 

 from Stat. 98, which is the largest, 11 Mill.; this latter specimen, which may have been washed 

 down to that considerable depth, is bleached and shows only traces of striae on both extremities, 

 which are more distinct on the two other specimens; this latter character reminds A. ealedoniciim 

 Crosse, but that species has been described as "striated", without the restriction that this should 

 only be at the extremities. Now of the specimens under consideration, that from Stat. 98 is 

 nearly quite smooth, with only a few striae at the posterior extremity and perhaps one or two 

 at the anterior one, that from Stat. 285 has anterior and posterior striae and is smooth at the 

 central part of the back, and that from Stat. 2 has also a few indistinct striae on the back, 

 but it is not decussated, as it should be in A. ealedonicum, nor can I detect brown spots on 

 the back, for the spots I see on the last-named specimen, seem to be accidental. 



4. Amphiperas margarita Sowerby. 



Sowerbv. Spec. Conchyl. Vol I, part I, Ovulum, p. 4, fig. 19, 20. 

 KlEXER. Coq. Viv. Vol. I, Ovula, p. 11, PI. 6, fig. 4. 

 REEVE. Conch. Ie. Vol. XV, Ovulum, fig. 10. 



WEINKAUFF. Martini-Chemn. Conch. Cab. Ed. II, Vol. V, Ovula, p. 145, PI. 46, fig. 2, 3. 

 TRVOX. Man. of Conch. Vol. VII, p. 248, PI. 2, fig. 34, 35. 



33 



SIROGA-EXPED1TIE XLIX 1 /'. " 19 



